Unit 3 Sections 8 and 10
During this lesson sections 8 and 10 will discuss lists and iteration
• 6739 min read
Section Objectives:
- Express an algorithm that uses iteration without using a programming language
- Determine the result or side effect of iteration statements
- Write iteration statement
Section Vocabulary:
Iteration: a repeating portion of an algorithm, repeats a specified number of times or until a given condition is met
Iteration Statements: change the sequential flow of control by repeating a set of statements zero or more times, until a stopping condition is met
Repeat Until: if the condition evaluates to true initially, the loop body is not executed at all, due to the condition being checked before the loop.
Unit 3 Section 8.1 - Taiyo Iwazaki
Lesson Objectives:
- Express an algorithm that uses iteration without using a programming language
- Define an iteration
- The Basics Of Iteration
- Examples
LESSON Vocab:
- Iteration: a repeating portion of an algorithm, repeats a specified number of times or until a given condition is met
Before we dive deeper, we need to understand that an iteration is a part of an algorithm. And in that iteration is a set of instructions that need to be followed until a certain desired output is met.
Examples
Here is an example using online shopping:
Lets say you are looking for a lost item inside of your house... What steps would you take?
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Suppose there are n rooms to search... number the rooms 1-n
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Start by searching in room number 1
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Search each room thoroughly for you item.
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Change the room number to the next highest number
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Repeat steps 3 and 4 until you have found your lost item.
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Enjoy the lost item.
WAIT! There is a flaw in the program.
This is where a stopping condition is useful for when the iteration already meets the desired requirement and gets out of the loop.
i = 0
while (i < 5):
print("Hello, World!")
i = i + 1
Hello, World! Hello, World! Hello, World! Hello, World! Hello, World!
i = 0
while (i < 310): #Try changing the 5 and see what happens!
print("Hello, World!")
i = i + 1
if (i == 310): #Try Changing the 3 and see what happens!
break
Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! Hello, World!
These are just a few examples of what you can do with iteration.
Unit 3 Section 3.8.2 - Parav Salaniwal
Definition: Iteration Statement - cause statements to be executed zero or more times, subject to some loop-termination criteria
The first function we will learn is the range function, which we will use with for loop. As you may be able to guess, this will give us the sum based on the input provided. We always use a variable, such as i, to represent what the range of numbers the output will show. For example, if I wanted to list the numbers from 1-10 using the range function, it would look like this:
for i in range(10000):
print(i)
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 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Now the first thing you may notice is my input for the range was 11, and you may wonder why is it not 10? This is because when using the range function, the last number, or the ending value, is not included in the output, therefore we would have to add 1 to receive the correct output. Now if we were looking to include a starting value to have it start from 1 and end at 10, the code would look like this:
for i in range(54,345):
print(i)
54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344
When using the range with for loop, the you can list much more than just a increment of one, would anyone like to guess how we could include a change in the incremented value? Try making a change in the python code above to change the incremented value. When using the range function:
for i in range(1, 5, 3):
print(i)
1 4
Now with while loops, we can provide a similar output with a variation in the input. Similar to for loops, it requires a variable which is the starting value.
i=1
while i<=10:
print(i)
i=i+1
1 2 3 4 5 6 7 8 9 10
Based on your knowledge from for loops, which values in the code above are the starting, incrementing, and ending values?
LESSON
Unit 3 Section 3.8.3 - Nikhil
Here is some basic code I have created, let's first look into this one: I created a list of pets, cat, dog, fish, and snake. Then I created a for loop, "for i in pets" and this looks at every element/value in pets, so "cat", "dog", "fish" and "snake". This next if statmenets checks if the element in the list is "fish" and if it is, it breaks the loop. The statement would just print, cat and dog since the loop breaks at fish.
pets = ["cat", "dog", "fish", "snake"]
for i in pets:
if i == "fish":
break
print(i)
cat dog
This while loop checks if number less than 10 is even and if so, it will print out the even numbers. We set a starting value of number = 0, then while the number is less than 10, the percent sign means modulus so meaning if there is a remaninder when we dvide. So if number divided by 2 has no remainder then it will print number. Then after that it will add 1 to the number and repeat the process untill it reaches 10. So let's check for 0, while 0 is less than ten, then it moves to next statement, since 0 divded by 2 has a remainder of 0 it will print the value of 0. Now it will add 1 to zero. Then it will see that 1 is less than ten, and then check if 1 divided by 2 has a remainder of 0 which it does not, so it skips the print, and goes straight to addding one, so on so forth.
number = 0
while number < 10:
if number % 2 == 0:
print(number)
number += 1
0 2 4 6 8
The purpose of this code is to find the sum of all the even numbers between and any number of your choosing. The integer input asks for the minimum and maximum value. The next statement puts a starting sum value set to 0. The for i in range (minimum,maximum+1) looks at every number between those two values, in this case 1 and 100. Then the if i modulus 2 checks if any numbers that are divisible by 2 and the remainder comes to 0. If there is a number that has a remainder of 0 when divided by 2, it adds that number to the sum. Then the last print statement, prints out the final sum of all even numbers between the two numbers of your choosing.
minimum = int(input("please enter a minimum number you want your range to be"))
maximum = int(input("please enter a number that you want to be the maximum value"))
sum = 0
for i in range(minimum,maximum+1):
if i % 2 == 0:
sum += i
print("The sum of all the even numbers between", minimum, "and", maximum, ":", sum)
The sum of all the even numbers between 1 and 3 : 2
LESSON
- Define an Iteration
- iteration is a repetition of a process
- Make your own example of an iteration with at least 4 steps and a stopping condition(Similar to mine that I did)
- Lose keys
- search the last place you saw it
- if not found, search the other last place you saw it
- if not found, give up
- if found, enjoy your keys
- Program a simple iteration.
i = 0
while (i < 310):
print("Burrito")
i = i + 1
if (i == 310):
break
Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito Burrito
- What is an iteration statement, in your own words?
- when the same procedure is repeated multiple times
- Create a descending list of numbers using for loop
- below
- Using while loop, make a list of numbers which will form an output of 3,16,29,42,55,68,81
- below
number = 0
while number < 10:
if number % 2 == 0:
print(number)
number -= 1